net/mac802154/wpan.c

   1 /*
   2  * Copyright 2007-2012 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Written by:
  18  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  19  * Sergey Lapin <slapin@ossfans.org>
  20  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  21  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  22  */
  23
  24 #include <linux/netdevice.h>
  25 #include <linux/module.h>
  26 #include <linux/if_arp.h>
  27
  28 #include <net/rtnetlink.h>
  29 #include <linux/nl802154.h>
  30 #include <net/af_ieee802154.h>
  31 #include <net/mac802154.h>
  32 #include <net/ieee802154_netdev.h>
  33 #include <net/ieee802154.h>
  34 #include <net/wpan-phy.h>
  35
  36 #include "mac802154.h"
  37
  38 static inline int mac802154_fetch_skb_u8(struct sk_buff *skb, u8 *val)
  39 {
  40         if (unlikely(!pskb_may_pull(skb, 1)))
  41                 return -EINVAL;
  42
  43         *val = skb->data[0];
  44          skb_pull(skb, 1);
  45
  46         return 0;
  47 }
  48
  49 static inline int mac802154_fetch_skb_u16(struct sk_buff *skb, u16 *val)
  50 {
  51         if (unlikely(!pskb_may_pull(skb, 2)))
  52                 return -EINVAL;
  53
  54         *val = skb->data[0] | (skb->data[1] << 8);
  55         skb_pull(skb, 2);
  56
  57         return 0;
  58 }
  59
  60 static inline void mac802154_haddr_copy_swap(u8 *dest, const u8 *src)
  61 {
  62         int i;
  63         for (i = 0; i < IEEE802154_ADDR_LEN; i++)
  64                 dest[IEEE802154_ADDR_LEN - i - 1] = src[i];
  65 }
  66
  67 static int
  68 mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  69 {
  70         struct mac802154_sub_if_data *priv = netdev_priv(dev);
  71         struct sockaddr_ieee802154 *sa =
  72                 (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
  73         int err = -ENOIOCTLCMD;
  74
  75         spin_lock_bh(&priv->mib_lock);
  76
  77         switch (cmd) {
  78         case SIOCGIFADDR:
  79                 if (priv->pan_id == IEEE802154_PANID_BROADCAST ||
  80                     priv->short_addr == IEEE802154_ADDR_BROADCAST) {
  81                         err = -EADDRNOTAVAIL;
  82                         break;
  83                 }
  84
  85                 sa->family = AF_IEEE802154;
  86                 sa->addr.addr_type = IEEE802154_ADDR_SHORT;
  87                 sa->addr.pan_id = priv->pan_id;
  88                 sa->addr.short_addr = priv->short_addr;
  89
  90                 err = 0;
  91                 break;
  92         case SIOCSIFADDR:
  93                 dev_warn(&dev->dev,
  94                          "Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
  95                 if (sa->family != AF_IEEE802154 ||
  96                     sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
  97                     sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
  98                     sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
  99                     sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
 100                         err = -EINVAL;
 101                         break;
 102                 }
 103
 104                 priv->pan_id = sa->addr.pan_id;
 105                 priv->short_addr = sa->addr.short_addr;
 106
 107                 err = 0;
 108                 break;
 109         }
 110
 111         spin_unlock_bh(&priv->mib_lock);
 112         return err;
 113 }
 114
 115 static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
 116 {
 117         struct sockaddr *addr = p;
 118
 119         if (netif_running(dev))
 120                 return -EBUSY;
 121
 122         /* FIXME: validate addr */
 123         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 124         mac802154_dev_set_ieee_addr(dev);
 125         return 0;
 126 }
 127
 128 static int mac802154_header_create(struct sk_buff *skb,
 129                                    struct net_device *dev,
 130                                    unsigned short type,
 131                                    const void *_daddr,
 132                                    const void *_saddr,
 133                                    unsigned len)
 134 {
 135         const struct ieee802154_addr *saddr = _saddr;
 136         const struct ieee802154_addr *daddr = _daddr;
 137         struct ieee802154_addr dev_addr;
 138         struct mac802154_sub_if_data *priv = netdev_priv(dev);
 139         int pos = 2;
 140         u8 *head;
 141         u16 fc;
 142
 143         if (!daddr)
 144                 return -EINVAL;
 145
 146         head = kzalloc(MAC802154_FRAME_HARD_HEADER_LEN, GFP_KERNEL);
 147         if (head == NULL)
 148                 return -ENOMEM;
 149
 150         head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
 151         fc = mac_cb_type(skb);
 152
 153         if (!saddr) {
 154                 spin_lock_bh(&priv->mib_lock);
 155
 156                 if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
 157                     priv->short_addr == IEEE802154_ADDR_UNDEF ||
 158                     priv->pan_id == IEEE802154_PANID_BROADCAST) {
 159                         dev_addr.addr_type = IEEE802154_ADDR_LONG;
 160                         memcpy(dev_addr.hwaddr, dev->dev_addr,
 161                                IEEE802154_ADDR_LEN);
 162                 } else {
 163                         dev_addr.addr_type = IEEE802154_ADDR_SHORT;
 164                         dev_addr.short_addr = priv->short_addr;
 165                 }
 166
 167                 dev_addr.pan_id = priv->pan_id;
 168                 saddr = &dev_addr;
 169
 170                 spin_unlock_bh(&priv->mib_lock);
 171         }
 172
 173         if (daddr->addr_type != IEEE802154_ADDR_NONE) {
 174                 fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
 175
 176                 head[pos++] = daddr->pan_id & 0xff;
 177                 head[pos++] = daddr->pan_id >> 8;
 178
 179                 if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
 180                         head[pos++] = daddr->short_addr & 0xff;
 181                         head[pos++] = daddr->short_addr >> 8;
 182                 } else {
 183                         mac802154_haddr_copy_swap(head + pos, daddr->hwaddr);
 184                         pos += IEEE802154_ADDR_LEN;
 185                 }
 186         }
 187
 188         if (saddr->addr_type != IEEE802154_ADDR_NONE) {
 189                 fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
 190
 191                 if ((saddr->pan_id == daddr->pan_id) &&
 192                     (saddr->pan_id != IEEE802154_PANID_BROADCAST)) {
 193                         /* PANID compression/intra PAN */
 194                         fc |= IEEE802154_FC_INTRA_PAN;
 195                 } else {
 196                         head[pos++] = saddr->pan_id & 0xff;
 197                         head[pos++] = saddr->pan_id >> 8;
 198                 }
 199
 200                 if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
 201                         head[pos++] = saddr->short_addr & 0xff;
 202                         head[pos++] = saddr->short_addr >> 8;
 203                 } else {
 204                         mac802154_haddr_copy_swap(head + pos, saddr->hwaddr);
 205                         pos += IEEE802154_ADDR_LEN;
 206                 }
 207         }
 208
 209         head[0] = fc;
 210         head[1] = fc >> 8;
 211
 212         memcpy(skb_push(skb, pos), head, pos);
 213         kfree(head);
 214
 215         return pos;
 216 }
 217
 218 static int
 219 mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 220 {
 221         const u8 *hdr = skb_mac_header(skb);
 222         const u8 *tail = skb_tail_pointer(skb);
 223         struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
 224         u16 fc;
 225         int da_type;
 226
 227         if (hdr + 3 > tail)
 228                 goto malformed;
 229
 230         fc = hdr[0] | (hdr[1] << 8);
 231
 232         hdr += 3;
 233
 234         da_type = IEEE802154_FC_DAMODE(fc);
 235         addr->addr_type = IEEE802154_FC_SAMODE(fc);
 236
 237         switch (da_type) {
 238         case IEEE802154_ADDR_NONE:
 239                 if (fc & IEEE802154_FC_INTRA_PAN)
 240                         goto malformed;
 241                 break;
 242         case IEEE802154_ADDR_LONG:
 243                 if (fc & IEEE802154_FC_INTRA_PAN) {
 244                         if (hdr + 2 > tail)
 245                                 goto malformed;
 246                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 247                         hdr += 2;
 248                 }
 249
 250                 if (hdr + IEEE802154_ADDR_LEN > tail)
 251                         goto malformed;
 252
 253                 hdr += IEEE802154_ADDR_LEN;
 254                 break;
 255         case IEEE802154_ADDR_SHORT:
 256                 if (fc & IEEE802154_FC_INTRA_PAN) {
 257                         if (hdr + 2 > tail)
 258                                 goto malformed;
 259                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 260                         hdr += 2;
 261                 }
 262
 263                 if (hdr + 2 > tail)
 264                         goto malformed;
 265
 266                 hdr += 2;
 267                 break;
 268         default:
 269                 goto malformed;
 270
 271         }
 272
 273         switch (addr->addr_type) {
 274         case IEEE802154_ADDR_NONE:
 275                 break;
 276         case IEEE802154_ADDR_LONG:
 277                 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
 278                         if (hdr + 2 > tail)
 279                                 goto malformed;
 280                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 281                         hdr += 2;
 282                 }
 283
 284                 if (hdr + IEEE802154_ADDR_LEN > tail)
 285                         goto malformed;
 286
 287                 mac802154_haddr_copy_swap(addr->hwaddr, hdr);
 288                 hdr += IEEE802154_ADDR_LEN;
 289                 break;
 290         case IEEE802154_ADDR_SHORT:
 291                 if (!(fc & IEEE802154_FC_INTRA_PAN)) {
 292                         if (hdr + 2 > tail)
 293                                 goto malformed;
 294                         addr->pan_id = hdr[0] | (hdr[1] << 8);
 295                         hdr += 2;
 296                 }
 297
 298                 if (hdr + 2 > tail)
 299                         goto malformed;
 300
 301                 addr->short_addr = hdr[0] | (hdr[1] << 8);
 302                 hdr += 2;
 303                 break;
 304         default:
 305                 goto malformed;
 306         }
 307
 308         return sizeof(struct ieee802154_addr);
 309
 310 malformed:
 311         pr_debug("malformed packet\n");
 312         return 0;
 313 }
 314
 315 static netdev_tx_t
 316 mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
 317 {
 318         struct mac802154_sub_if_data *priv;
 319         u8 chan, page;
 320
 321         priv = netdev_priv(dev);
 322
 323         spin_lock_bh(&priv->mib_lock);
 324         chan = priv->chan;
 325         page = priv->page;
 326         spin_unlock_bh(&priv->mib_lock);
 327
 328         if (chan == MAC802154_CHAN_NONE ||
 329             page >= WPAN_NUM_PAGES ||
 330             chan >= WPAN_NUM_CHANNELS) {
 331                 kfree_skb(skb);
 332                 return NETDEV_TX_OK;
 333         }
 334
 335         skb->skb_iif = dev->ifindex;
 336         dev->stats.tx_packets++;
 337         dev->stats.tx_bytes += skb->len;
 338
 339         return mac802154_tx(priv->hw, skb, page, chan);
 340 }
 341
 342 static struct header_ops mac802154_header_ops = {
 343         .create         = mac802154_header_create,
 344         .parse          = mac802154_header_parse,
 345 };
 346
 347 static const struct net_device_ops mac802154_wpan_ops = {
 348         .ndo_open               = mac802154_slave_open,
 349         .ndo_stop               = mac802154_slave_close,
 350         .ndo_start_xmit         = mac802154_wpan_xmit,
 351         .ndo_do_ioctl           = mac802154_wpan_ioctl,
 352         .ndo_set_mac_address    = mac802154_wpan_mac_addr,
 353 };
 354
 355 void mac802154_wpan_setup(struct net_device *dev)
 356 {
 357         struct mac802154_sub_if_data *priv;
 358
 359         dev->addr_len           = IEEE802154_ADDR_LEN;
 360         memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 361
 362         dev->hard_header_len    = MAC802154_FRAME_HARD_HEADER_LEN;
 363         dev->header_ops         = &mac802154_header_ops;
 364         dev->needed_tailroom    = 2; /* FCS */
 365         dev->mtu                = IEEE802154_MTU;
 366         dev->tx_queue_len       = 10;
 367         dev->type               = ARPHRD_IEEE802154;
 368         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 369         dev->watchdog_timeo     = 0;
 370
 371         dev->destructor         = free_netdev;
 372         dev->netdev_ops         = &mac802154_wpan_ops;
 373         dev->ml_priv            = &mac802154_mlme_wpan;
 374
 375         priv = netdev_priv(dev);
 376         priv->type = IEEE802154_DEV_WPAN;
 377
 378         priv->chan = MAC802154_CHAN_NONE;
 379         priv->page = 0;
 380
 381         spin_lock_init(&priv->mib_lock);
 382
 383         get_random_bytes(&priv->bsn, 1);
 384         get_random_bytes(&priv->dsn, 1);
 385
 386         priv->pan_id = IEEE802154_PANID_BROADCAST;
 387         priv->short_addr = IEEE802154_ADDR_BROADCAST;
 388 }
 389
 390 static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
 391 {
 392         return netif_rx(skb);
 393 }
 394
 395 static int
 396 mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
 397 {
 398         pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
 399
 400         spin_lock_bh(&sdata->mib_lock);
 401
 402         switch (mac_cb(skb)->da.addr_type) {
 403         case IEEE802154_ADDR_NONE:
 404                 if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
 405                         /* FIXME: check if we are PAN coordinator */
 406                         skb->pkt_type = PACKET_OTHERHOST;
 407                 else
 408                         /* ACK comes with both addresses empty */
 409                         skb->pkt_type = PACKET_HOST;
 410                 break;
 411         case IEEE802154_ADDR_LONG:
 412                 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
 413                     mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
 414                         skb->pkt_type = PACKET_OTHERHOST;
 415                 else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
 416                                  IEEE802154_ADDR_LEN))
 417                         skb->pkt_type = PACKET_HOST;
 418                 else
 419                         skb->pkt_type = PACKET_OTHERHOST;
 420                 break;
 421         case IEEE802154_ADDR_SHORT:
 422                 if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
 423                     mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
 424                         skb->pkt_type = PACKET_OTHERHOST;
 425                 else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
 426                         skb->pkt_type = PACKET_HOST;
 427                 else if (mac_cb(skb)->da.short_addr ==
 428                                         IEEE802154_ADDR_BROADCAST)
 429                         skb->pkt_type = PACKET_BROADCAST;
 430                 else
 431                         skb->pkt_type = PACKET_OTHERHOST;
 432                 break;
 433         default:
 434                 break;
 435         }
 436
 437         spin_unlock_bh(&sdata->mib_lock);
 438
 439         skb->dev = sdata->dev;
 440
 441         sdata->dev->stats.rx_packets++;
 442         sdata->dev->stats.rx_bytes += skb->len;
 443
 444         switch (mac_cb_type(skb)) {
 445         case IEEE802154_FC_TYPE_DATA:
 446                 return mac802154_process_data(sdata->dev, skb);
 447         default:
 448                 pr_warning("ieee802154: bad frame received (type = %d)\n",
 449                            mac_cb_type(skb));
 450                 kfree_skb(skb);
 451                 return NET_RX_DROP;
 452         }
 453 }
 454
 455 static int mac802154_parse_frame_start(struct sk_buff *skb)
 456 {
 457         u8 *head = skb->data;
 458         u16 fc;
 459
 460         if (mac802154_fetch_skb_u16(skb, &fc) ||
 461             mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
 462                 goto err;
 463
 464         pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
 465
 466         mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
 467         mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
 468         mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
 469
 470         if (fc & IEEE802154_FC_INTRA_PAN)
 471                 mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
 472
 473         if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
 474                 if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
 475                         goto err;
 476
 477                 /* source PAN id compression */
 478                 if (mac_cb_is_intrapan(skb))
 479                         mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
 480
 481                 pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
 482
 483                 if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
 484                         u16 *da = &(mac_cb(skb)->da.short_addr);
 485
 486                         if (mac802154_fetch_skb_u16(skb, da))
 487                                 goto err;
 488
 489                         pr_debug("destination address is short: %04x\n",
 490                                  mac_cb(skb)->da.short_addr);
 491                 } else {
 492                         if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
 493                                 goto err;
 494
 495                         mac802154_haddr_copy_swap(mac_cb(skb)->da.hwaddr,
 496                                                   skb->data);
 497                         skb_pull(skb, IEEE802154_ADDR_LEN);
 498
 499                         pr_debug("destination address is hardware\n");
 500                 }
 501         }
 502
 503         if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
 504                 /* non PAN-compression, fetch source address id */
 505                 if (!(mac_cb_is_intrapan(skb))) {
 506                         u16 *sa_pan = &(mac_cb(skb)->sa.pan_id);
 507
 508                         if (mac802154_fetch_skb_u16(skb, sa_pan))
 509                                 goto err;
 510                 }
 511
 512                 pr_debug("source PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
 513
 514                 if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
 515                         u16 *sa = &(mac_cb(skb)->sa.short_addr);
 516
 517                         if (mac802154_fetch_skb_u16(skb, sa))
 518                                 goto err;
 519
 520                         pr_debug("source address is short: %04x\n",
 521                                  mac_cb(skb)->sa.short_addr);
 522                 } else {
 523                         if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
 524                                 goto err;
 525
 526                         mac802154_haddr_copy_swap(mac_cb(skb)->sa.hwaddr,
 527                                                   skb->data);
 528                         skb_pull(skb, IEEE802154_ADDR_LEN);
 529
 530                         pr_debug("source address is hardware\n");
 531                 }
 532         }
 533
 534         return 0;
 535 err:
 536         return -EINVAL;
 537 }
 538
 539 void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
 540 {
 541         int ret;
 542         struct sk_buff *sskb;
 543         struct mac802154_sub_if_data *sdata;
 544
 545         ret = mac802154_parse_frame_start(skb);
 546         if (ret) {
 547                 pr_debug("got invalid frame\n");
 548                 return;
 549         }
 550
 551         rcu_read_lock();
 552         list_for_each_entry_rcu(sdata, &priv->slaves, list) {
 553                 if (sdata->type != IEEE802154_DEV_WPAN)
 554                         continue;
 555
 556                 sskb = skb_clone(skb, GFP_ATOMIC);
 557                 if (sskb)
 558                         mac802154_subif_frame(sdata, sskb);
 559         }
 560         rcu_read_unlock();
 561 }